US 4,228,521 A · Phase controlled decoder for bubble memories

Abstract

An on-chip magnetic bubble decoder comprising a plurality of sequentially operated gates oriented to be responsive to different phases of the rotating in-plane magnetic field and connected to a conductor which is pulsed at the selected phase of the cycle to transfer bubbles from one track onto different tracks to be propagated therefrom. In its simplest form, one gate oriented to be operated during the phase 2 time of the cycle and a second gate oriented to be responsive to the phase 1 time of the cycle, all operable by a single conductor, thus form a four output decoder with two gates and a single conductor. A second conductor controls a third gate which modulates the bubble stream to control the data being decoded.Further embodiments of the invention include 8 output decoder (2 data bits decoded into 1 of 4 paths) with only two conductors for activating the gates and a 1 of 16 output decoder with 2 conductors for decoding and a third for data control. In another embodiment the 16 output decoder is arranged with the data control gates located at the decoder output to reduce write cycle latency.

Claims10

Dependent claims

A phase controlled decoder on a magnetic bubble domain propagation structure which includes means capable of supporting magnetic domains thereon and which has propagate elements on which bubbles propagate element-to-element in response to a rotating in-plane magnetic field, said propagate elements defining bubble flow paths,

a plurality of said propagate elements being transfer elements, oriented on said structure differently from each other and relative to different field directions of said rotating in-plane magnetic field,
each said transfer elements being located in one flow path which forms an input flow path to receive bubbles therefrom and connected to two flow paths thus forming a gate by which bubbles from said input flow path will be directed to one of the two flow paths forming output flow paths from said gate,
at least one of said output flow paths from one gate being connected to the input flow path of a gate located subsequent to the flow of bubbles through said one gate, and
a single electrical conductor means coupled to a plurality of said transfer elements to activate said gate to direct said bubble onto one of said output flow paths in response to the application of a current pulse on said electrical conductor means.

1 more element

Dependencies are inferred from the claim text.

Phase controlled decoder for bubble memories

Life of this patent

Phase controlled decoder for bubble memories

Life of this patent

Abstract

Claims10